<div class="form-group">
    <label class="control-label col-md-3">{{ field.verbose_name }}</label>
    <div class="col-md-9">
        <select id="select2_{{ field.name }}_{{ is_search }}" class="form-control select2 input-lg" name="select2_{{ field.name }}" style="width:100%">
            <option value="AL">Alabama</option>
            <option value="WY">Wyoming</option>
        </select>
    </div>
</div>
<script>
    $('#select2_{{ field.name }}_{{ is_search }}').select2({
        placeholder: "请选择...",
        minimumResultsForSearch: Infinity
    });
</script>